Wired: Why Do Razor Blades Get Dull So Quickly? Here’s a theory about why it hasn’t been a focal point for manufacturers. “Customers surveyed by Harry’s who use the firm’s products have an emotional connection to changing their shaving cartridge. ‘When they throw away an older cartridge and click on something new, it signifies something fresh.'” Ha! Everyone knows you get that feeling my restarting your laptop.